Ok, I can sort of see what you mean in that video, but what if the changes caused by running the turns are necessary? After all, about half of any distance race is run on them, so maybe learning to run curves effeciently is just part of training and adaption?
Maybe someone who looks perfect running down the straights is losing time/energy on the curves, whereas someone like Coe loses a little time on the straights but a lot less time on the curves, and so is faster overall?
Curve running is a skill as well that is rarely talked about except for the 200m.
I am by no means saying that we should never ever run on track, or that we should not try to master efficient curve running. Coe coming out of the curve running as if he was still on it is a sign that he has made mostly left turns while track training, and that he hasn't spent the necessary time sorting out those imbalances after each track session. For me, at least, I believe the balance is to run in both directions on the track, and to incorporate the kind of remedial work that "flow" recommended to regain pelvic balance (from glutes to TFL to adductors to psoas to quadratus lumborum)on a regular basis.
And yes, whenever possible, train off track. But no, do not totally ban track work making left turns and do not neglect efficient curve running. That's why I posted way earlier asking Old Sub 4 questions regarding curve running technique & how elites cope with track running.
(And by the way, "flow", I've tried your MET Yoga technique and it truly works for me)